›› 2016, Vol. 37 ›› Issue (12): 3455-3462.doi: 10.16285/j.rsm.2016.12.014

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Experiment and evaluation of compaction characteristics of sodium sulfate saline soil

WEN Tao1, MI Hai-zhen1, MA Lian-sheng1, 2, YING Sai1   

  1. 1. School of Civil Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. School of Science, Lanzhou University of Technology, Lanzhou, Gansu 730050, China
  • Received:2014-12-09 Online:2016-12-10 Published:2018-06-09
  • Supported by:

    This work was supported by the Joint Research Fund of Institute of Electric Power Design of Gansu Province and Lanzhou University of Technology (2011620111000485).

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Abstract: A proper degree of compactness is very important for reducing the dilatancy and collapsibility of sulfate saline soil foundation. To investigate the compaction characteristics, the microstructure characteristics of sodium sulfate saline soil with different preparation conditions were investigated using scanning electron microscope (SEM). It is found that the compaction characteristics and microstructure characteristics of sodium sulfate saline soil after compaction are related to the state of sodium sulfate in soil. As sodium sulfate solution possesses lubrication, the compaction characteristic of sodium sulfate saline soil is significantly improved as salt content increases. After the soil is compacted, the soil aggregates are mostly thin layers with smooth surface, and the soil has a rhyotaxitic mosaic structure. However, sodium sulfate decahydrate acts like a scaffold in the soil, the increase of salt content reduces significantly the compaction characteristics of sodium sulfate saline soil. After compaction, the soil aggregates are tiny and round, and the soil has a net-like open structure. The effect of sample pretreatment method and curing time on the compactness of sodium sulfate saline soil are analyzed, and the evaluation method for the compactness is suggested.

Key words: sulfate saline soil, compaction characteristics, compactness, microstructure characteristics

CLC Number: 

  • TD 823

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